Bennet,
Whenever we go to a National P6 ROC meeting there is always a stall selling P6 stuff and he has trays and trays of grommets, fixing clips, self tappers and all the other little things essential to fitting anything on our cars.
Although I have never noticed any prominent signs I believe that this guy is Ray Weekly so he is sure to have some (perhaps our illustrious chairman could confirm this identity?), contact details in LINKS.
Hope this helps.
Regards, John.